33894 Datasheet, PDF (19/28 Pages) Freescale Semiconductor, Inc – Quad High-Side Switch

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
SOLDERING INFORMATION
The 33894 is packaged in a surface mount power package
intended to be soldered directly on the printed circuit board.
The 33894 was qualified in accordance with JEDEC
standards JESD22-A113-B and J-STD-020A. The
recommended reflow conditions are as follows:
• Convection: 235°C +5.0/-0°C
• Vapor Phase Reflow (VPR): 235°C +5.0/-0°C
• Infrared (IR)/Convection: 235°C +5.0/-0°C
The maximum peak temperature during the soldering
process should not exceed 240°C. The time at maximum
temperature should range from 10 s to 40 s maximum.
LOGIC COMMANDS AND REGISTERS
CCSSB
CS
SCLK
SI
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SO
OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0
NOTE^NS^o: ^te1.^s
2.
3.
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Figure 9. Single 16-Bit Word SPI Communication
SERIAL INPUT COMMUNICATION
SPI communication is accomplished using 16-bit
messages. A message is transmitted by the MCU starting
with the MSB D15 and ending with the LSB, D0 (Table 7).
Each incoming command message on the SI pin can be
interpreted using the following bit assignments: the MSB,
D15, is the watchdog bit. In some cases, output selection is
done with bits D12 : D11. The next three bits, D10 : D8, are
used to select the command register. The remaining five bits,
D4 : D0, are used to configure and control the outputs and
their protection features.
Multiple messages can be transmitted in succession to
accommodate those applications where daisy chaining is
desirable, or to confirm transmitted data, as long as the
messages are all multiples of 16 bits. Any attempt made to
latch in a message that is not 16 bits will be ignored.
The 33894 has defined registers, which are used to
configure the device and to control the state of the outputs.
Table 8, page 20, summarizes the SI registers.
Table 7. SI Message Bit Assignment
Bit Sig SI Msg Bit
Message Bit Description
MSB
D15
Watchdog in: toggled to satisfy watchdog
requirements.
D14 : D15
D12 : D11
Not used.
Register address bits used in some cases
for output selection.
D10:D8 Register address bits.
D7 : D5
D4 : D1
Not used.
Used to configure the inputs, outputs, and
the device protection features and SO
status content.
LSB
D0
Used to configure the inputs, outputs, and
the device protection features and SO
status content.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33894
19